<!DOCTYPE html>
<html>

<head>
  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  <meta content="width=device-width,initial-scale=1,user-scalable=no" name="viewport">
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-touch-fullscreen" content="yes">
  <meta name="format-detection" content="telephone=no,address=no">
  <meta name="apple-mobile-web-app-status-bar-style" content="white">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  <title></title>
  <script>
    !function (n) {
      function e() {
        var e = n.document.documentElement, t = e.getBoundingClientRect().width;
        e.style.fontSize = t >= 640 ? "40px" : t <= 320 ? "20px" : t / 320 * 20 + "px"
      }
      n.addEventListener("resize", (function () { e() })), e()
    }(window);
  </script>
</head>

<body>
  <div id="app"></div>
</body>

</html>